put correlation report into report module
Merge remote-tracking branch 'upstream/master'
fixed output directory of correlation report
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
added comments to correlation table computation function report_utils.R

Synced with the original fork with master ML. Should be up to date now.
render functions update
update output_dir correlation report functions
Merge remote-tracking branch 'upstream/master'
output_dir updated
Merge pull request #5 from oddmilk/master

correlation report dir fix